Get uncommon values from two or more arrays - php

Question

Is there any function in PHP which will give an array of uncommon values from two or more arrays?
For example:
$array1 = array( "green", "red", "blue");
$array2 = array( "green", "yellow", "red");
....
$result = Function_Needed($array1, $array2,...);
print_r($result);
Should give the output:
array("blue", "yellow", ...);

Answer 1

Use array_diff and array_merge:
$result = array_merge(array_diff($array1, $array2), array_diff($array2, $array1));
Here's a demo.
For multiple arrays, combine it with a callback and array_reduce:
function unique(&$a, $b) {
return $a ? array_merge(array_diff($a, $b), array_diff($b, $a)) : $b;
}
$arrays = array(
array('green', 'red', 'blue'),
array('green', 'yellow', 'red')
);
$result = array_reduce($arrays, 'unique');
And here's a demo of that.

Answer 2

$result = array_diff($array1, $array2) + array_diff($array2, $array1);

Answer 3

Try array_diff.​​​​​​​​​​​​​​

Answer 4

This should do it. It can be extended to work with more than two arrays. It basically counts the common key occurrences and returns those with count of one:
$a = array('yellow', 'blue', 'red', 'green');
$b = array('blue', 'purple', 'green');
function unintersect($a, $b)
{
$x = array_fill_keys($a, 1);
foreach ($b as $v) {
$x[$v]++; // this might trigger warning
}
return array_keys(array_filter($x, function($v) {
return $v === 1;
}));
}
print_r(unintersect($a, $b));
Returns:
Array
(
[0] => yellow
[1] => red
[2] => purple
)